放大器提供Piezofilm传感器的信号调理

摘要：描述的电路提供了一个从piezofilm传感器的热输出。该电路是一个高输入阻抗的差分电荷放大器，使用三运放仪表放大器配置了几分古典。差阶段拒绝电阻产生的热噪声，并作为一阶高通滤波器。元件值的选择进行了讨论，并一些典型valuese建议。备用配置建议，为克服一些典型电路限制。

Maxim>AppNotes>AmplifierandComparatorCircuitsSensorsKeywords:thermalsensor,temperaturesensor,piezoelectric,high-impedanceinput,high-Zbufferamplifier,tempsensor,piezo,chargeJun26,2002amplifier,high-passfilter,noiserejection,common-moderejection,CMR,differentialtosingle-ended,signalconditioning,APPLICATIONNOTE1127AmplifierProvidesSignalConditioningforPiezofilmSensorAbstract:Describedcircuitprovidesathermaloutputfromapiezofilmtransducer.Thecircuitisahigh-input-impedancedifferentialchargeamplifierusingthreeopampsinasomewhatclassicalinstrumentationamplifierconfiguration.Thedifferentialstagerejectsresistor-generatedthermalnoise,andactsasafirst-orderhigh-passfilter.Choiceofcomponentvaluesis